Using venv in Python

Using venv in Python allows you to create a virtual environment, which is an isolated environment to manage dependencies for a specific project. Here's how you can use it step by step:

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1. Create a Virtual Environment

1. Open your terminal or command prompt.
2. Navigate to the folder where you want to create the virtual environment.
3. Run the following command:

   python -m venv myenv
   

   • Replace myenv with the name you want for your virtual environment.
   • This will create a directory named myenv containing the virtual environment.

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2. Activate the Virtual Environment

Activation depends on your operating system:

• On Windows:

  myenv\Scripts\activate
  

• On macOS/Linux:

  source myenv/bin/activate
  

After activation, your terminal prompt will change, showing the name of the virtual environment (e.g., (myenv)).

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3. Install Dependencies

With the virtual environment activated, you can now install packages using pip:

pip install package_name

For example:

pip install requests

To save installed packages to a requirements file:

pip freeze > requirements.txt

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4. Deactivate the Virtual Environment

When you're done working in the virtual environment, deactivate it by running:

deactivate

This will return your terminal to the global Python environment.

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5. Re-Activate Later

If you come back to the project later, re-activate the virtual environment using the activate command from step 2.

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6. Install Dependencies from a Requirements File

To install dependencies listed in a requirements.txt file, use:

pip install -r requirements.txt

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Using venv helps keep project dependencies organized and prevents conflicts between projects. If you have further questions or need help with specific configurations, let me know!